[PATCH 4.19 106/425] media: dvbdev: Fix memory leak in dvb_media_device_free()

From: Greg Kroah-Hartman
Date: Thu May 20 2021 - 05:46:13 EST


From: Peilin Ye <yepeilin.cs@xxxxxxxxx>

commit bf9a40ae8d722f281a2721779595d6df1c33a0bf upstream.

dvb_media_device_free() is leaking memory. Free `dvbdev->adapter->conn`
before setting it to NULL, as documented in include/media/media-device.h:
"The media_entity instance itself must be freed explicitly by the driver
if required."

Link: https://syzkaller.appspot.com/bug?id=9bbe4b842c98f0ed05c5eed77a226e9de33bf298

Link: https://lore.kernel.org/linux-media/20201211083039.521617-1-yepeilin.cs@xxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Fixes: 0230d60e4661 ("[media] dvbdev: Add RF connector if needed")
Reported-by: syzbot+7f09440acc069a0d38ac@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Peilin Ye <yepeilin.cs@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/media/dvb-core/dvbdev.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/media/dvb-core/dvbdev.c
+++ b/drivers/media/dvb-core/dvbdev.c
@@ -241,6 +241,7 @@ static void dvb_media_device_free(struct

if (dvbdev->adapter->conn) {
media_device_unregister_entity(dvbdev->adapter->conn);
+ kfree(dvbdev->adapter->conn);
dvbdev->adapter->conn = NULL;
kfree(dvbdev->adapter->conn_pads);
dvbdev->adapter->conn_pads = NULL;